Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B261A 02 : Passenger Compartment Dimming 4 Circuit Short to GroundDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Accent Lamp Signal - Driver Door Module | 1 | 1 | 1 | -- |
Accent Lamp Signal - Passenger Door Module | 1 | 1 | 1 | -- |
Accent Lamp Control | B261A 02 | 1 | 1 | -- |
Accent Lamp Driver Door Ground | -- | 1 | -- | -- |
Accent Lamp Driver Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Door Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Left I/P Ground | -- | 1 | -- | -- |
Accent Lamp Lower Left I/P Ground | -- | 1 | -- | -- |
Accent Lamp Left Rear Door Ground | -- | 1 | -- | -- |
Accent Lamp Left Rear Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Driver Seat Ground | -- | 1 | -- | -- |
Accent Lamp Overhead Console Ground | -- | 1 | -- | -- |
Accent Lamp Right I/P Ground | -- | 1 | -- | -- |
Accent Lamp Lower Right I/P Ground | -- | 1 | -- | -- |
Accent Lamp Right Rear Door Ground | -- | 1 | -- | -- |
Accent Lamp Right Rear Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Seat Ground | -- | 1 | -- | -- |
1. Interior Accent Lighting Malfunction | ||||
Circuit/System Description
The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the light are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the individual accent lamps via the accent lamps control circuit. The BCM also sends a serial data message to the driver and front passenger door control modules requesting the accent lamps on both doors be dimmed to the requested level. The driver and front passenger door modules respond by applying the appropriate voltage for the requested dim level to the accent lights.
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | Park lamps ON. |
Conditions for Setting the DTC
DTC B261A 02 will set when the BCM detects a short to ground in the accent lamp control circuit.
Actions Taken When the DTC Sets
When DTC B261A 02 is present, the BCM will not illuminate the accent lamps supplied by the accent lamp control circuit.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the following components:
- Ignition ON, with a scan tool clear the DTC and operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
- Reconnect each accent lamp one at a time and verify that the DTC does not reset as current after each accent lamps is reconnected.
| • | Accent lamp - driver seat |
| • | Accent lamp - lower left I/P |
| • | Accent lamp - left I/P |
| • | Accent lamp - left rear door |
| • | Accent lamp - left rear door handle |
| • | Accent lamp - overhead console |
| • | Accent lamp - passenger seat |
| • | Accent lamp - lower right I/P |
| • | Accent lamp - right I/P |
| • | Accent lamp - right rear door |
| • | Accent lamp - right rear door handle |
| ⇒ | If DTC B261A 02 sets as current, test the accent lamp control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the DTC sets as current, test or replace the accent lamp responsible for setting the DTC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
